Thermo King SLXi Spectrum, Maintenance Manual

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Refrigeration Service Operations 11-19
4. Unscrew the nut/four screws that attaches the stepper motor and piston assembly to the valve body.
5. If the complete ETV assembly is being replaced, remove the ETV mounting hardware (if used) and unsolder and remove the
valve body. It may be necessary to unsolder other tubes near the valve body to obtain enough clearance to remove the valve
body. Note the position of the valve body so the new one will be placed in the same position. The new ETV could interfere
with other components if it is not placed in the same position as the old one.
CAUTION: Use a heat sink or wrap valve with wet rags to prevent damaging the valve.
Installation of Service Kit
NOTE: Do not connect the main/unified wire harness to the ETV and turn the unit on before the stepper motor and piston
assembly is installed in the valve body. The controller is programmed to close the ETV when the unit is turned on. If the unit
is turned on with the ETV connected to main wire harness, the controller will attempt to close the ETV. This will cause the
piston to be turned (screwed) off the threaded shaft of the stepper motor because the valve body is not present to stop it.
1. The new stepper motor and piston assembly is supplied with the piston in the open position. In the open position the bottom
edge of the piston is 8 to 18 mm (0.3 to 0.7 in.) from the bottom edge of the piston housing. The piston retracts to open and
extends to close.
1. Bottom Edge of the Piston Housing
2. Bottom Edge of the Piston
ARA2500
ARA2501
1
2